HP bought Autonomy in 2011 for more than $10 billion, but later wrote off $8.8 billion of the purchase price after discovering what it called serious accounting irregularities on the part of Autonomy prior to the deal.

Hussain "was one of the chief architects of the massive fraud on HP that precipitated this litigation," HP said in a response to Hussain's motion on Monday. "The notion that he should be permitted to intervene and challenge the substance of a settlement designed to protect the interests of the company he defrauded is ludicrous."

Hussain knows HP will sue him in England where discovery rules are more limiting, HP added. He "also knows that prosecutors on both sides of the Atlantic are investigating him, that HP is cooperating with those authorities and that, until he is charged, he has no access to the information that HP is providing to the authorities."

The former executive is wrapping himself "in a mantle of self-righteousness in an attempt to obtain discovery that he hopes will help him stay out of prison and defend the civil litigation he expects HP will file in the UK," the filing alleges.

Autonomy founder and CEO Mike Lynch, who was ousted from HP in 2012, has denied any wrongdoing, saying publicly that HP was aware of Autonomy's accounting practices before the acquisition and has conducted a smear campaign against him and others.

Lynch couldn't immediately be reached for comment. However, a spokesman for Lynch told Recode on Monday that HP's filing was "breathless ranting" and "the sort of personal smear we've come to expect."

An attorney for Hussain was equally dismissive. "Ask yourself why, if they are so concerned about fraud, HP has been scared to sue anywhere for three years," John Keker told Bloomberg.